Sound-reproducer.



PATENTED NOV. 13, 1906.

T. H. MACDONALD. SOUND REPRODUGER.

APPLICATION FILED MAR.

2 SHEETS-SHEET 1 No. 885,544. PATENTED NOV. 13, 1906. T. H. MACDONALD.

SOUND RBPRODUGBR.

APPLICATION FILED MAR. 27,1906.

2 SHEETSSHEET 2v A CORPGHAHDN AME-REGAN seer crncus senses-r,

()1 WEEJZT VIRGENEA.

l il i n e g "Ll no. sense Specification c1 Letters Patent.

Application filed March 3'7, 1908, Serial Hot 808,36

To all? whmn/ it rnozy concern:

Be it known that I, THOMAS H. IVIAGDON ALD, a citizen of the UnitedStates of .elnerice, and a resident of BridgeportfFsirfield 5 county,Connecticut, have invented a new and useful lniprcvenient. inScund-Reproducers, which improvement is fully set forth in'the fcllcwingspecification.

This invention has reference to the constructionof sound-reproducers foruse with the same time secure the above-mentioned in-' dispensableresults. So far as I am aware,

these efforts have not been entirely successful from a commercialstandpoint, since the structures Were either too complicated for use inthe hands or any but skilled experts or else were too expensive tomanufacture, and in some instances both of these objections obtained.

The object of the present invention is se cure by the use ofspriugtension the 5 practical results heretofore obtained by the use ofa Weight, While at the same time providing a structure which is simplein opera-- tion and may be cheaply constructed.

' The inventive idea inyoive-i in the present so invention find somevariety of inechenicsl ertpressien, but, generally speaker consists incombining with the diupl in and a stylus connected therewith pin iocr--naled to turn in the mine of the reprctlucer '45 in s planeapproximately perpendiculer to ,the diaphragm, which pin carries aspring tending to press the stylus against the soundrecord. This affordsa structure that may he cheaply manufactured, is perfectly simple inopereticn', and is thoroughly effective since as shove ales:

weight is dispensed the and all parts more with the pin,

Furtherincre, the present inventicn net only secures high erficiency insound-reprc duction, but it results also in an economics and durableconstruction. The fleeting and its lee-e is telien by relatively htslets to which stylus-her pivot-ed. crecver, the spring acts. when theis not in tc' held the supperting piste f I rec end greatly nishing thee'eility t'einjur'y. Areprc dues? of iniprcveti construction cun c? e.is at one e' e tcsthe hcrizon as Well as at another, u thecrdinsrygrevity-ree prcrlucer ivili c u edventsgeously at the particularLe-E which the Weight has been calculated. 1 V in the best form in whichthe haven L0 has thus been applied. the reprcducer enricl it phrsgm hereno niovernen. the tablet, thestylus pivoted to s r porting-plate hingedso to move t5 diculsrly to the tablet and the syring" being 1 stop,thereby pre' enting applied to this supporting-piste. When thereproducer is brought into itscperetive' tion, the pressure of thestylus on the ts lifts the supporting-piste 'cni its rest or and puts .eune: tension or 86hr pressicn, es ce. l H l shes not a "fixed c at ninhcr which 1 lunged or swiveieci to. urn on an ca 's at right engles .(crepprcxiinsteiy "0) to the phlegm. The stylus is first her, so that thebeing 3? the swinging part 33? l tendency te force the reprcducer hesrenroducing-noint the contrary, the ccnstru'ction here, in descrihed'gives h results in trscl mm than reproducers Eire," o sly in use.

In the scccmpsnying: drawings, g5 form part cf this specification,Figure 1' is s sectional View through the centerof' the disphragm,illustrating a. reprcducer constructed in accordance with the invention.2'is e bcttorn clan vie thereof. Fig.3 is s g srsenses of the guard andstop. Fig. Sis a view in cross-section of a modified form. of the mountinto the frame 25.

spiral spr' I Fig. 6 is a detail in section of'the hinge thereofl Theframe and diaphra m 26 of the reproducer are or may be of or inaryconstruction. The stylus-lever 8 is pivoted to a stud 9, attached to thesupporting-plate 10, the latter being hinged at 12 to a pin 28, which isjournaled in a tube or bushing 29, screwed Supporting-plate 10 istherefore pivoted so as to turn freely on an axis substantially at rightangles to the diaphragm. Stylus-lever 8 is connected to the diaphragm bya flexible connection 13, as usual. Hinge-pin 28 has a downward projection 30, to which is attached one end of 16, whose other end isattached to plate 10. his spring tends to hold the stylus in contactwith the sound-record, but being carried entirely by the swingin part ofthe reproducer it has no tendency to rce the stylus out of thesound-groove. Hinge-pin 28 has an elongated bearing in tube 29, so as toprevent binding due to the pull of the spr-in The top of tube or bushing29 is close by a screw 31.

Figs. 5 and 6 illustrate a modified construction of the hinge. Pin 28instead of being journaled in the tube 29 is pivoted at its ends betweencenters 32 33. One of these centers passes through the top of tube 29and the other through a strap 34, attached to the frame 25 and passinunder pin 28, which has a bend or ofiset at this point. Thisconstruction gives the result of the elongated bearing with lessfriction than the construction shown in Figs. 1 and 2.

The free end of hinged plate 10 has a pin 14, which projects through ahole in guideplate 15. Tl]lS hole is of ample width to afford freelateral play to the plate. The up- .per side of this hole is madeV-shaped to guide the swinging parts to a central position when raisedby the lifting-cam. This insures the proper position of the stylus whendro ped upon the record.

- e frame 25 of the reproducer which can ries the diaphragm is attachedto the usual carriage 35, and in this case the attachment is a rigidone, so that the. diaphragm is not movable toward and from thesound-record except in response to vibratory motions of the stylus. Thelifting-cam 7 acts upon the tailpiece 36 of plate 10, lifting the latter(and the stylus with it) without moving the diaphragm and its support.

The mounting herein described has advantages even when the pressure ofthe stylus against the sound-record is due entirely to gravity.- I

Having thus described my invention, I claim 1. In a sound-producer, thecombination with the diaphragm and stylus-lever connected therewith, ofa support to which said stylus-lever is pivoted, a hinge-pin journaledat approximately right angles to the diaphragm, said stylus-supportbeing pivoted directly to said pin, and a spring attached at one end tosaid pin and at the other to said'support.

2. In a sound-reproducer, the combination with the diaphragm, of astylusdever attached thereto, a supporting-plate to which saidstylus-lever is pivoted, a pin having bearings in the frame of thereproducer approximate y at right angles to the'diaphragm, said plate being pivoted to said pin so as to move freely toward and from thesound-record, and means carried wholly by theswinging part of thereproducer for pressing the stylus against the sound-record.

3. The combination with the diaphragm, of a stylus connected therewith,a supportingplate to which the stylus is attached, a hingepin having anelongated bearing in the frame, said plate being pivoted direct y tosaid pin, and means carried wholly by said pin for pressing the stylusagainst the sound-record. 9o

4. The combination with the diaphragm, of a stylus connected therewith,a supportingplate for said stylus, a hinge-pin having an elongatedbearing in the reproducer-frame, said plate being pivoted directly tosaid pin, and a spring attached at one end to said pin and at the otherto said plate.

5. The combination with the diaphragm and stylus connected therewith, ofa pin journaled in the frame approximately perpendicu- 1 oo lar to theplane of the diaphragm, and a spring carried by said in and tending topress the stylus against the sound-record.

6. The combination with the diaphragm and stylus connected therewith ofa pin jour- 1o 5 naled 1n the frame approximatelyperpendicularly to thediaphragm, a support for said stylus pivoted directly to said pin andmovable. toward and from the sound-record, a spring carried by said pinand pressing said stylus 10 .toward the sound-record, and means forlifting said stylus against the pressure of said sprin without movingthe d1aphragm.

7. The combination with the diaphragm and stylus connected therewith, ofa pin jour- I I 5 naled in the frame approximatelyperpendicularltothedia hra m, a' su port for said sty us pivoted d irecty to sai pinand movable universally independently of said dia phragm, means forlifting said support, and a I 20 guide for centering said support andstylus when lifted.

8. In a sound-reproducer, a frame, a diaphragm supported therein, a pinat right an gles to the plane of the diaphragm and'jour- I naled to turnin the frame at a point exterior to the periphery of the diaphragm, aplate pivoted to said pin, a stylus supported by said plate andconnected to said diaphragm,-

and a spring carried by said pin and acting on said plate to hold thestylus in contact with l the record.

In testimony whereof I have signed this specification in the presence oftwo subscrib- 1o ing- Witnesses.

THOMAS H. MACDONALD.

Witnesses A. B. KEOUGH, C. A. GIBNER.

